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Thread: Use DOS to regulate pH in Aquaponics system

  1. #1
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    Use DOS to regulate pH in Aquaponics system

    Hello. I’m wondering if the DOS can be used to regulate ph within a certain range. I want to regulate ph using an alkaline solution of potassium hydroxide. I would like the pump to turn on once ph drops to 6 and then stop once ph reaches 7. Would that be possible?

  2. #2
    Frequent Contributor zombie's Avatar
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    Yes. The basic process is to make a virtual outlet

    DOSenable
    If pH < 6.1 Then ON
    If pH > 6.9 Then OFF

    Set the wizard to dose some amount over 24 hours. This will take some trial and error and is dependent on how quickly you want pH to rise.

    Then click the gear icon and add this line

    If Outlet DOSenable = OFF Then OFF

    You might be an engineer if...You have no life and can prove it mathematically.

  3. #3
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    Thank you for your quick reply.

    The reason to let the pH swing is that the plant nutrient availability changes with pH. Iron for instance is more readily available for plants at a lower pH ( high five/ low six) and phosphorus and potassium at a higher pH. Thus by having some variation in pH we reduce the risk of nutrient deficiency in plants.

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